这样的参数值怎么用正则提取

我要循环读取N多行如下的语句(下边是文件中两行内容),每行参数个数有不一样的,怎么用正则提取出dirid这个参数的值呢?  
   
   
  /phone/pic_preview.jsp?/ani/detail_at.jsp?nofee=1&type=pic&id=57379&sid=Tu0zzhedyOOsifky&dirid=01791717&p=1&rmdmms=0&session=&allowmix=0&MISC_ID=999&MISC_SessionID=999-5a2a0955!-1113006057!2069560405!1157471948381&MISC_ServiceID=30071221&MISC_AccessMode=2&MISC_MID=00110113389045  
   
   
   
  /phone/ring_preview.jsp?/ani/detail_at.jsp?nofee=1&type=ring&id=6564&sid=pxMVNPPm1sSSZW3P&needfree=0&dirid=&p=1&session=&MISC_ID=999&MISC_SessionID=999-58ca1169!-1914267070!-825445728!1157471998635&MISC_ServiceID=30071221&MISC_AccessMode=2&MISC_MID=00136069904045

---

<?php  
  $url1   =   '/phone/pic_preview.jsp?/ani/detail_at.jsp?nofee=1&type=pic&id=57379&sid=Tu0zzhedyOOsifky&dirid=01791717&p=1&rmdmms=0&session=&allowmix=0&MISC_ID=999&MISC_SessionID=999-5a2a0955!-1113006057!2069560405!1157471948381&MISC_ServiceID=30071221&MISC_AccessMode=2&MISC_MID=00110113389045';  
  $url2   =   '/phone/ring_preview.jsp?/ani/detail_at.jsp?nofee=1&type=ring&id=6564&sid=pxMVNPPm1sSSZW3P&needfree=0&dirid=&p=1&session=&MISC_ID=999&MISC_SessionID=999-58ca1169!-1914267070!-825445728!1157471998635&MISC_ServiceID=30071221&MISC_AccessMode=2&MISC_MID=00136069904045';  
  ereg('dirid=([^&]*)',   $url1,   $out);  
  echo   $out[1];  
  ereg('dirid=([^&]*)',   $url2,   $out);  
  echo   $out[1];  
  ?>

---

循环一次，假如写入变量   $s:  
   
  $s="/phone/pic_preview.jsp?/ani/detail_at.jsp?nofee=1&type=pic&id=57379&sid=Tu0zzhedyOOsifky&dirid=01791717&p=1&rmdmms=0&session=&allowmix=0&MISC_ID=999&MISC_SessionID=999-5a2a0955!-1113006057!2069560405!1157471948381&MISC_ServiceID=30071221&MISC_AccessMode=2&MISC_MID=00110113389045";  
  //$s   =   "/phone/ring_preview.jsp?/ani/detail_at.jsp?nofee=1&type=ring&id=6564&sid=pxMVNPPm1sSSZW3P&needfree=0&dirid=&p=1&session=&MISC_ID=999&MISC_SessionID=999-58ca1169!-1914267070!-825445728!1157471998635&MISC_ServiceID=30071221&MISC_AccessMode=2&MISC_MID=00136069904045";    
   
  preg_match("|/phone/.*dirid=(.*?)\&.*|is",$s,$r);  
  echo   $r[1];

---

parse_str(array_pop(explode("?",$url1)));  
  echo   $dirid;

---

nb啊```星星就是星星```  
 

---

parse_str(array_pop(explode("?",$url1)));  

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